1. info-Powered Energy System Research Center (i-PERC), The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
2. Faculty of Informatics & Engineering, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
3. Department of Mechanical Engineering, Kyushu Institute of Technology, Kitakyushu, Fukuoka 804-8550, Japan
4. Graduate School of Life Science & Systems Engineering, Kyushu Institute of Technology, Kitakyushu, Fukuoka 808-0196, Japan
5. Department of Electrical and Electronic Engineering, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
6. Department of Electrical and Electronic Engineering, Miyazaki University, Miyazaki 889-2192, Japan